Fix typos in comments (#254)
Fix typos in comments (#254)

a the -> the
timestmap -> timestamp
badded -> padded
its -> it is
callers -> caller's
kangwoo/prometheus,kangwoo/prometheus,Gouthamve/prometheus,GoogleCloudPlatform/prometheus,kangwoo/prometheus,alileza/prometheus,alileza/prometheus,alileza/prometheus,Gouthamve/prometheus,prometheus/prometheus,prometheus/tsdb,Gouthamve/prometheus,prometheus/prometheus,prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,prometheus/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,Gouthamve/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,Gouthamve/tsdb,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,kangwoo/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus